Drill-bit swelling and dressing apparatus



Apr., 24,1923. Mmmm IP-II: MARTIN DRILL BIT AS'J'v'E-LLING AND DRESSING APPARATUS il L 18 Strom/w11 u MWWMW@ 2 Sheets-Sheet 2 Filed Aug.

HI A MARTIN DRILL BIT SWELLING AND DRESSING APPARATUS itil `sidine at Brad in the count am an a i illusie haii nantais a. Maurin, or sealer, Terras.

Application filed [ingest 11, 1921. Serial No. 491,492.

To` all when?, may Concern.'

Be it` lrnowuhthat lihnnifrij li. lilairriln, a citizen of the 'Uni-ted eltates ol. rhnicrica. rey oi irlcullech and Efltate ot 'lleizasf ,if "exited new and usc'lful lininrwelnr ll-liit fil/well- "ure` and Dressing,l lliliparatus, o" ufhicn the following is a specification.

The object oithe invention is to `proidde simple and ellicient means whereby a drill hit oLtthe t f de used in dee i `well dfrillinsil .in conneetion with drill guardsor inlilie spurl`- dine;.oper-ation@` and Vwhich iu practice he- `come eireuiiiiferentially worn and theieliy reduced in diameter may he swelled to and sl'iarpened, or dr Y out resorting to the tediousiy lahoifir-ius and une consuming` operation ojl`V heating; or h ani iueringthe saine with siede-es, as iuV the crdinai-'y practice, after liuatinn; the hit to render 1t workable, and which operates! hy reason oi?` `the time necessarily consumed i'ahereiul ire heating or reheatnge; el'

ject inl this connection to provide z. swellin and dressing` apparatus by the use oft which the drill may he properly :reshaijr i with a single heatinre iihereolAv and restored with greater arcu icy than has` hereto'lore been possible to its original condition; and with these objects in View the invention consists inaY coiistrru-tiou and combination of parts of which a preferred enihodirnent is shown Figure 2 a. horizontal section ou the plane* indicaterfl hy `the line oi l? ure 1. i "i liigure 3 is a iertical section ou the "plane indicated hy the line 3MB of .Figure l.

liigure 4L is an elevation showing; a slightly Inodiiied arrangement ot the power apply-- inomeans.

iigure 5 is a sectional View in detail ot the anvil. p

Figure 6 is a detail in perspective et the same. i

rlhe apparatus consists essentially ot an anvil 10 shaped to form a die correspond ing in gauge or dimensions with the drill head When in its proper `rendition and adapted to receive the drill 11 as indicated in Figure l., said anvil heine' preferably ar.-`

ed i atv intervals w' ti i diate point upon the end o1 the drill hit 1l, heini); `1"ulcru1'ned terminally as indieated'at lv-5l to a suitable standard or supportI 15 and havingl suitable power or operating mecha .uisin 1G connected with its free end as a means of swinging the lever downward to torce the hit face into the die ineniher of the anvil, it heilig understood that the drill hit at its operative end is heated as a step pref.` lnuinary to its arrangement in the die, so that longitudinal pressure applied to the hit througgh the actuation olthe hearing); lever will swell the hit While the sharpening of the edges thereoi and the truingr oli-dressiuu' of the hit circumierentially to insure a cylindrical exterior contour may he eil'ected hy means o'l" sledges striking' the side surfaces ofthe hit and reducing them to a conw dition `wherein tl ey are flush with the conifexed `side surfaces 17 oit the anvil.

ln the construction illustrated the standard or support is of channel forni with provision tor pivotingthe hearing lever at spaced points in the length thereotl `as hy having `aplurality o'li openings 18 arranged in series and adapted 'tor selective" engage" nient by the pivot pin 141 'to suit drill hits ot different lengths. i i. i

Aliso preferably the anvil is ci? hollen7 coustruction as shown in detail i-nifllipgure 5 te provide for estahlishingg` and inaintaiuinle,` 1

a circiiilation of the cooling agent therethrough during the shaping o1 the drill and particularly`` the lateral hammering and dressing` thereof, suitable supply and outlet tuhes 1 9 and Q0 heine` arranged in connnunication with the interior et the anvil, and the outletprelierahly discharges inte the teu'iperingr tray 12 havingl en overflow outlet 21 and a suitable rack 22 upon ii'l'iich the head oit' the drill hit may he raised for tempering and cooling` after it has heen shaped in the die.

Vllhe forni of power mechanism illustrated iu Figure il contemplates a tension bar 23 pivotally anchored to any suitable object such `as the tank or tray 1Q at 24 and con,- nected hy a rocking lever 25 with an operating' har 2G, the rocking` bar being intermediately connected hy a link 27 with the hearingI lere-r, and means being provided for applying a tensile strain 'to the opera-ting bar, such as an operating ratchet lever 28 engaging1 a raclr 297 the lower end'oit said operating; har being anchored as indicated at Il() and heth the tension and operating hars 23 and 26 being constructed for adjustable connection with the terminals of the rocking lever as by having series of openings 23EL and 26 respectively for engagement selectively by pivot pins 23b and 26h. This adjustment obviously is designed to compensate for any required adjustment of the pivot 14 to suit the length of the drill bit tol be treated.

It will be understood that the power applying mechanism as indicated is merely typical-of that which may be employed in this` connection and as shown in Figure et a modification thereof may consist in employing the operating bar 31 as a means of directly operating the bearing lever, the operating means 32 thereof being similar to those above described and the terminals of said bar being respectively anchored as indicated at 33 and adjustably connected as at 34 to the bearing lever 35. In this connection as heretofore described the operating lever may be provided with a series of openings 36 for selective lengagement by the pivot pin 37.

In practice, as will be obvious from the 'foregoing description, the operation or' swelling or enlarging and dressing a drill lconsists in heating the same as in the ordinary practice to a condition rendering it malleable and then applying the face of the bit to the die with the rear end of the bit in the path of the movement of the bearing lever, and then applying sufficient power' to the lever to 'force the head or operative end of the drill bit into the die and spread or'swell it to fit the accurately gauged face of the latter. In this spreading or swelling operation it is common for the bit to acquire a slight irregularity o form which may readily be corrected while under pressure and in the die by the application of the strokes of the malls or sledges to the exposed side surfaces thereof adjacent to and above the convened faces 17 to reduce the side surfaces of the bit to a condition flush with the surfaces 17 which being cylindrical will properly deline the cutting edges of the bit tace and result in a sharpening of the edges necessary to produce eh'iciency in drilling. rl`he final tempering of the bit as in the ordinary practice reduces it to a condition ready for subsequent use and as the operation oi spreading or swelling and dressing can be accomplished in a comparatively short time a single preliminary heating of the drill is ordinarily suiieient and therefore the successive reheating of the same, as in the ordinary practice, and the loss of time incident thereto are eliminated.

Having described the invention. what is claimed as new and useful isz- 1. A drill bit swelling and dressing ap paratus having an anvil provided with a die for the reception of the cutting head of the bit, a bearing member for imparting longitudinal movement of the bit toward the die, and means for actuating the bearing member, the bearing member consisting of a lever terminally mounted for pivotal movement and adapted for engagement at an intermediate point of its length with the rear end of the drill bit.

2. A drill bit swelling and dressing apparatus having an anvil provided with a die for the reception of the cutting head of the bit, a bearing member for imparting longitudinal movement of the bit toward the die, and means for actuating the bearing member, said anvil being arranged in a tempering tray having means for producing a circulation of tempering medium.

A drill bit swelling and dressing apparatus having an anvil provided with a die for the reception of the cutting head of the bit, a bearing member for imparting longitudinal movement of the Abit toward the die, and means for actuating the bearing member, the anvil being of lIlollow construction and having means for maintaining a circulation of a cooling agent therethrough.

In testimony whereof he aliixes his signature.

HARVEY A. MARTIN. 

